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A block is placed over a plank. The coef...

A block is placed over a plank. The coefficient of friction between the block and the plank is `mu= 0.2.` Initially both are at rest, suddenly the plank starts moving with acceleration `a_(0) = 4m//s^(2).` The displacement of the block in 1 is `(g=10m//s^(2))`

A

1 m relative to the ground

B

1 m relative to the plank

C

zero relative to the ground

D

2 m relative to the ground

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The correct Answer is:
A, B
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